A judge has refused to set bail for a teen charged with stabbing 20 fellow students and a security guard at his Pennsylvania high school, meaning the suspect will remain jailed.

Alex Hribal was just 16 when he went on the rampage at Franklin Regional High School in Murrysville. Hribal's charged as an adult, but had been housed in a juvenile detention center until he turned 18 Oct. 1 and had to be moved to the Westmoreland County Prison.

Hribal's attorney argued for bond so Hribal could be released to his parents until he stands trial or convinces a judge to move the case to juvenile court.

Alex Hribal's dad, Harold Hribal, took stand for defense. He said Alex Hribal would receive home schooling. Alex Hribal's mom, Tina, works from home and would be with him.

Sam King, the now-retired vice principal who tackled Alex Hribal, testified for prosecution he lives four doors down from Alex Hribal and would be uncomfortable if Alex Hribal was released on bail because there would be nothing physically restraining him from walking about the neighborhood.

But a judge refused to set bail, even with house arrest, saying there's no way to adequately ensure public safety.

Deputy warden at Westmoreland County prison also testified. He said Hribal gets along with everyone at prison, listens to rules and reads a lot. Hribal is currently allowed out of his cell and on his unit for eight hours each day to read, watch TV, etc. As of Thursday, he will be allowed out of his cell for 24 hours a day. He has 22 other inmates on his specialized unit - other units have 94-96 inmates per unit. Hribal is on the mental health unit.

Several victims and their family members from the Franklin Regional attacks provided written letters to the court in opposition to Hribal's request for bond.

Judge Christopher Feliciani said their letters made him aware of the "profound consequences" from the stabbing and Hribal's actions.

Here are some excerpts from the letters (victims' names are being withheld):

"(Our daughter's) injury has left her unable to use her right hand for many tasks that should come naturally. Her median nerve was severed and the hand muscles to her thumb and pointer finger have deteriorated ... She will carry her injury throughout her life ... How can someone who violently attacked 20 (sic) people with two knives, and had the intention of killing people that day, (sic) can he be safely released to await trial at home?...Please know that we pray for Alex and hope he continues to receive the help he needs. We pray for his family, that they receive the support they need. We pray for the kids that were injured and their respective families ..."______________

"My daughter was terrified to testify in June. She felt that by doing so, Alex would mark her for death when he got out of prison. She still has bad reactions to loud noises, sudden movements and has a hard time trusting people. She will have a scarred face to remind her of that day for the rest of her life. I cannot begin to imagine the fear she will experience when he is released ..."______________

"On the morning of April 9, 2014, I sent my happy, carefree, well-adjusted daughter off to school. That girl never came home. In her place was a girl who was afraid of crowds, scared to walk the hallways at school, terrified to leave my side ... Returning Alex Hribal to the community where he destroyed so many lives is wrong and will certainly be detrimental to the recovery of my daughter and countless more."______________

"To allow (Hribal) back in the same home where he devised a plan of attack and armed himself with weapons ... I am sorry, but I cannot abide such a decision."______________

"I was standing at my locker on April 9, 2014 when Alex Hribal came running wildly at me, screaming loud, illegible (sic) noises and waving two large knives. I am certain I would have been stabbed or slashed if it wasn't for a fellow student who jumped in front of me and was stabbed in the arm trying to protect me. I distinctly remember the dark look in Alex's eyes and the crazed expression on his face. I remember the chaos that ensued. I remember the terror I felt as I ran down the hallway with my two friends, trying to escape the horror that was happening in our school, in our hallway, at our lockers ... I do not believe Alex Hribal can be rehabilitated. He committed the crime. There is no denying that. He should do the time! He should stay in jail and should not be given the privilege of walking free where he could potentially plan and commit another heinous crime. He is a predator and he should remain locked up."